SQLiteBooks示例代碼丟失

Question

我發現這個鏈接無處不在的SQLite示例代碼（http://developer.apple.com/library/ios/#samplecode/SQLiteBooks/index.html），但它已被刪除或更改爲另一個位置..我找不到它在谷歌搜索..有誰知道任何其他鏈接到代碼或SQLite的任何其他良好的示例代碼？

Answer 1

可能這對你有用。

http://www.switchonthecode.com/tutorials/using-sqlite-on-the-iphone

http://dblog.com.au/iphone-development-tutorials/iphone-sdk-tutorial-reading-data-from-a-sqlite-database/

http://www.icodeblog.com/2008/08/19/iphone-programming-tutorial-creating-a-todo-list-using-sqlite-part-1/

Answer 2

你可以使用這個類，並在該類發送的查詢和使用這個類

.H

#import <Foundation/Foundation.h> 
#import "sqlite3.h" 

@interface DBLib : NSObject { 
sqlite3 *database; 
NSString *path; 

} 
- (NSString *)getDatabasePath:(NSString*)DBName; 
- (void)createEditableCopyOfDatabaseIfNeeded:(NSString*)DBName; 
- (void)initializeDatabase:(NSString*)DBName; 
-(NSMutableArray*)GetListBySQL:(NSString*)SQL; 
-(BOOL)UpdateData:(NSMutableDictionary*)objDic :(NSString*)PrimaryKey :(NSString*)TABLE_NAME; 
-(BOOL)deleteQuery:(NSString *)query; 

@end 

獲得源碼的所有功能

.M

#import "DBLib.h" 

@implementation DBLib 

#pragma mark Database methods 
- (NSString *)getDatabasePath:(NSString*)DBName 
{ 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) ; 
NSString *documentsDirectory = [paths objectAtIndex:0] ; 
return [documentsDirectory stringByAppendingPathComponent:DBName]; 
} 

// Creates a writable copy of the bundled default database in the application Documents directory. 
- (void)createEditableCopyOfDatabaseIfNeeded:(NSString*)DBName { 
// First, test for existence. 
BOOL success; 
NSFileManager *fileManager = [NSFileManager defaultManager]; 
NSError *error; 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
NSString *writableDBPath = [documentsDirectory stringByAppendingPathComponent:DBName]; 
success = [fileManager fileExistsAtPath:writableDBPath]; 
if (success) return; 
// The writable database does not exist, so copy the default to the appropriate location. 
NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:DBName]; 
success = [fileManager copyItemAtPath:defaultDBPath toPath:writableDBPath error:&error]; 
if (!success) { 
    NSString *errString = [NSString stringWithFormat:@"%@", [@"Fail" stringByReplacingOccurrencesOfString:@"#" withString:[error localizedDescription] ]]; 
    NSAssert1(0, @"%@", errString); 
} 
} 

// Open the database connection and retrieve minimal information for all objects. 
- (void)initializeDatabase:(NSString*)DBName {  

// The database is stored in the application bundle. 
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDirectory = [paths objectAtIndex:0]; 
path = [documentsDirectory stringByAppendingPathComponent:DBName]; 
NSStringEncoding enc = [NSString defaultCStringEncoding]; 
// Open the database. The database was prepared outside the application. 
if (sqlite3_open([path UTF8String], &database) == SQLITE_OK) 
{ 
    //TRUE 
    NSLog(@"Successfully opened-sqlite3"); 
} 
else 
{ 
    // Even though the open failed, call close to properly clean up resources. 
    sqlite3_close(database); 
    NSLog(@"closed"); 
    NSString *errString = [NSString stringWithFormat:@"%@", [@"Fail" stringByReplacingOccurrencesOfString:@"#" withString:[NSString stringWithCString:sqlite3_errmsg(database) encoding:enc] ]]; 
    NSAssert1(0, @"%@", errString); 
    // Additional error handling, as appropriate... 
} 
} 
-(NSMutableArray*)GetListBySQL:(NSString*)SQL 
{ 

    [self initializeDatabase:@"DBNAME"]; 

NSMutableArray* Array; 

Array=[[NSMutableArray alloc]init]; 
NSStringEncoding enc = [NSString defaultCStringEncoding]; 

sqlite3_stmt *select_statement=nil; 

if (sqlite3_prepare_v2(database, [SQL UTF8String], -1, &select_statement, NULL) != SQLITE_OK) { 
    NSString *errString = [NSString stringWithFormat:@"%@", [@"Fail" stringByReplacingOccurrencesOfString:@"#" withString:[NSString stringWithCString:sqlite3_errmsg(database) encoding:enc] ]]; 
    NSAssert1(0, @"%@", errString); 
} 

int columncount=sqlite3_column_count(select_statement); 

NSMutableDictionary* dic; 

while (sqlite3_step(select_statement) == SQLITE_ROW) 
{ 
    dic=[[NSMutableDictionary alloc]init]; 

    for(int j=0;j<columncount;j++) 
    { 
     if(sqlite3_column_text(select_statement, j)!=nil) 
      [dic setObject:[NSString stringWithUTF8String:(char *)sqlite3_column_text(select_statement, j)] forKey:[NSString stringWithUTF8String:(char *)sqlite3_column_name(select_statement,j)]]; 
     else 
      [dic setObject:@"" forKey:[NSString stringWithUTF8String:(char *)sqlite3_column_name(select_statement,j)]]; 
    } 

    [Array addObject:dic]; 
    [dic release];  
} 

sqlite3_finalize(select_statement); 

NSMutableArray *arr = [[NSMutableArray alloc] initWithArray: Array]; 

[Array release]; 

return arr; 
} 
//Method for Datbase 
-(BOOL)UpdateData:(NSMutableDictionary*)objDic :(NSString*)PrimaryKey :(NSString*)TABLE_NAME 
{ 
NSAutoreleasePool* pool=[[NSAutoreleasePool alloc]init]; 

[self initializeDatabase:DBNAME]; 


NSString* SQLColumns=@""; 
NSString* SQLValues=@""; 
NSString* SQL=@""; 

//Chekc Wheather Insert or update? 
BOOL IsNew=NO;; 
if([[objDic valueForKey:PrimaryKey] intValue]==0) 
{ 
    IsNew=YES; 
} 

NSArray* Keys=[objDic allKeys]; 
NSLog(@"%@",Keys); 
if(IsNew) 
{ 
    for(int i=0;i<Keys.count;i++) 
    { 
     if(![[Keys objectAtIndex:i] isEqual:PrimaryKey]) 
     { 
      SQLColumns=[NSString stringWithFormat:@"%@%@,",SQLColumns,[Keys objectAtIndex:i]]; 
      SQLValues=[NSString stringWithFormat:@"%@?,",SQLValues]; 
     } 
    } 

    if([SQLColumns length]>0) 
    { 
     SQLColumns=[SQLColumns substringToIndex:[SQLColumns length]-1]; 
     SQLValues=[SQLValues substringToIndex:[SQLValues length]-1]; 
    } 

    SQL=[NSString stringWithFormat:@"INSERT INTO %@ (%@) Values(%@)",TABLE_NAME,SQLColumns,SQLValues]; 

} 
else 
{ 
    for(int i=0;i<Keys.count;i++) 
    { 
     if(![[Keys objectAtIndex:i] isEqual:PrimaryKey]) 
     { 
      SQLColumns=[NSString stringWithFormat:@"%@%@=?,",SQLColumns,[Keys objectAtIndex:i]]; 
     } 
    } 

    if([SQLColumns length]>0) 
    { 
     SQLColumns=[SQLColumns substringToIndex:[SQLColumns length]-1]; 
    } 

    SQL=[NSString stringWithFormat:@"UPDATE %@ SET %@ WHERE %@=?",TABLE_NAME,SQLColumns,PrimaryKey]; 
    //NSLog(sql); 
} 

sqlite3_stmt *insert_statement=nil; 

if (sqlite3_prepare_v2(database, [SQL UTF8String], -1, &insert_statement, NULL) != SQLITE_OK) { 
    //NSAssert1(0, @"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database)); 
    NSLog(@"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database)); 
}     

int intBindIndex=1; 
for(int i=0;i<Keys.count;i++) 
{ 
    if(![[Keys objectAtIndex:i] isEqual:PrimaryKey]) 
    { 
     sqlite3_bind_text(insert_statement,intBindIndex,[[objDic valueForKey:[Keys objectAtIndex:i]] UTF8String],-1, SQLITE_STATIC); 
     intBindIndex++; 
    } 
} 

if(!IsNew) 
{ 
    sqlite3_bind_text(insert_statement,Keys.count,[[objDic valueForKey:PrimaryKey] UTF8String],-1, SQLITE_STATIC); 
} 

int result; 
result=sqlite3_step(insert_statement); 

if(IsNew) 
{ 
    [objDic setObject:[NSString stringWithFormat:@"%d",sqlite3_last_insert_rowid(database)] forKey:PrimaryKey];  
} 

sqlite3_finalize(insert_statement); 
[pool release]; 
NSLog(@"result:%d",result); 
if(result==SQLITE_DONE) 
    return YES; 
else  
    return NO; 
} 


-(BOOL)deleteQuery:(NSString *)query 
{ 
NSAutoreleasePool* pool=[[NSAutoreleasePool alloc]init]; 

[self initializeDatabase:DBNAME]; 


NSString* SQL=@""; 
SQL=[NSString stringWithString:query]; 
sqlite3_stmt *insert_statement=nil; 

if (sqlite3_prepare_v2(database, [SQL UTF8String], -1, &insert_statement, NULL) != SQLITE_OK) { 
    //NSAssert1(0, @"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database)); 
    NSLog(@"Error: failed to prepare statement with message '%s'.", sqlite3_errmsg(database)); 
}     

int result; 
result=sqlite3_step(insert_statement); 
sqlite3_finalize(insert_statement); 
[pool release]; 
NSLog(@"result:%d",result); 
if(result==SQLITE_DONE) 
    return YES; 
else  
    return NO; 

} 

@end